<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <!-- 提示 -->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
                :closable="false">
            </el-alert>
            <!-- 进度条 -->
            <el-steps :active="Number(activeIndex)" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave='beforeTabLeave' @tab-click='tabClicked'>
                    <!-- 一 -->
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="cateList"
                                :props="cateProps"
                                @change="handleChange()">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <!-- 二 -->
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item v-for="i in manyTableData" :key="i.attr_id" :label="i.attr_name">
                            <el-checkbox-group v-model="i.attr_vals">
                                <el-checkbox :label="j" v-for="(j,index) in i.attr_vals" :key="index" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <!-- 三 -->
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="i.attr_name" v-for="i in onlyTableData" :key="i.attr_id">
                            <el-input v-model="i.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <!-- 四 -->
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action表示图片上传到的地址，headers获取请求头 -->
                        <el-upload
                            action="http://127.0.0.1:8888/api/private/v1/upload"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headersObj"
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <!-- 五 -->
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 最终添加商品按钮 -->
                        <el-button type="primary" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
// 深拷贝库
import _ from 'lodash'

export default {
    name:'Add',
    data() {
        return {
            activeIndex:'0',
            // 添加商品的表单数据
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_number:0,
                goods_weight:0,
                // 商品分类
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 富文本编辑器双向绑定数据（商品详情描述）
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[{required:true,message:'请输入商品名称',trigger:'blur'}],
                goods_price:[{required:true,message:'请输入商品价格',trigger:'blur'}],
                goods_number:[{required:true,message:'请输入商品数量',trigger:'blur'}],
                goods_weight:[{required:true,message:'请输入商品重量',trigger:'blur'}],
            },
            // 商品分类，用于填写商品基本信息时勾选
            cateList:[],
            // 级联选择器配置
            cateProps:{
                expandTrigger: 'hover',
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数
            manyTableData:[],
            // 静态属性
            onlyTableData:[],
            // 请求头
            headersObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false
        }
    },
    methods: {
        // 获取商品分类，填写商品基本信息时勾选
        async getCateList(){
            const {data:result}=await this.$http.get('categories')
            if(result.meta.status!==200){
                this.$message.error('拉了库里')
            }else{
                this.cateList=result.data
            }
        },
        // 级联选择器选中项变化时触发的回调
        handleChange(){
            if(this.addForm.goods_cat.length !==3){
                this.addForm.goods_cat=[]
            }
        },
        // tab标签发生变化时，activeName是新的（点击的）tab的name，oldActiveName是旧的tab的name
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName==='0' && this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        // 点击tab标签触发的事件
        async tabClicked(){
            if(this.activeIndex==='1'){
                const {data:result}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                if(result.meta.status!==200){
                    this.$message.error('查询商品参数失败')
                }else{
                    // 字符串改成数组
                    result.data=result.data.forEach((item)=>{
                        item.attr_vals.length===0 ? [] : item.attr_vals.split(' ')
                    })
                    this.manyTableData=result.data
                }
            }
            else if(this.activeIndex==='2'){
                const {data:result}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                if(result.meta.status!==200){
                    this.$message.error('查询商品参数失败')
                }else{
                    this.onlyTableData=result.data
                }
            }
        },
        // 图片预览
        handlePreview(file){
            this.previewPath=file.response.data.url
            this.previewVisible=true
        },
        // 移除图片
        handleRemove(file){
            const filePath=file.response.data['tmp_path']
            const i=this.addForm.pics.findIndex((x)=>{
                x.pic===filePath
            })
            this.addForm.pics.splice(i,1)
        },
        // 图片上传成功时的事件,response响应数据
        handleSuccess(response){
            const picInfo={pic:response.data.tmp_path}
            this.addForm.pics.push(picInfo)
        },
        add(){
            this.$refs['addFormRef'].validate(async (valid)=>{
                if(!valid){
                    this.$message.error('请填写必要的表单内容')
                }else{
                    // 深拷贝
                    const form=_.cloneDeep(this.addForm)
                    form.goods_cat=form.goods_cat.join(',')
                    // 处理动态参数和静态属性
                    this.manyTableData.forEach((item)=>{
                        const newInfo={attr_id:item.attr_id, attr_value:item.attr_vals.join(' ')}
                        this.addForm.attrs.push(newInfo)
                    })
                    this.onlyTableData.forEach((item)=>{
                        const newInfo={attr_id:item.attr_id, attr_value:item.attr_vals}
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs=this.addForm.attrs
                    const {data:result}=await this.$http.post('goods',form)
                    if(result.meta.status!==201){
                        this.$message.error('添加商品失败')
                    }else{
                        this.$message.success('添加商品成功')
                        this.$router.push('/goods')
                    }
                }
            })
        }
    },
    computed:{
        // 三级分类的id
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
        }
    },
    created(){
        this.getCateList()
    }
}
</script>

<style lang='less' scoped>
.previewImg{
    width: 100%;
}
</style>